IDY25400: Pressure (all-lvls) "all-flds" fields

A number of raw and post-processed NWP products are available as outputs from the Australian Community Climate Earth-System Simulator (ACCESS) suite of Numerical Weather Prediction models which are run routinely by the Bureau of Meteorology's National Meteorological & Oceanographic Centre (NMOC). This document describes the content of the ACCESS-C VICTAS (version APS0) IDY25400.all-flds.all-lvls.YYYYMMDDHH.HHH.pressure series of products.

Model summary

ACCESS-C VICTAS covers the Victoria/Tasmania domain, has a resolution of about 5 km and is run twice per day (00Z and 12Z basetimes) out to a forecast hour of +36. This model is nested in the ACCESS-R model and consists of only a forecast component.

NWP data filename convention

All NWP files in this product series have names that conform to the following convention:

IDY25400.all-flds.all-lvls.YYYYMMDDHH.HHH.pressure.grb or IDY25400.all-flds.all-lvls.YYYYMMDDHH.HHH.pressure.nc

Dewpoint temperature. Calculated by (iteratively) finding the
temperature at which the partial pressure due to water vapour equals the
saturated water vapour partial pressure where the saturation partial
pressure of water vapour represents the saturation vapour pressure over
liquid water for temperatures above the triple point, over ice for
temperatures 20 degrees below the triple point, and a linear combination
of the two for temperatures in-between. [K]

156.128

geop_ht

Geopotential height of level (m above the geoid). [m]

132.128

merid_wnd

Meridional (V) component of the wind velocity. [m s-1]

157.128

relhum

Relative humidity. Calculated as
100*water_vapour_pressure/saturation_partial_pressure_of_water_vapour
where the the saturation partial pressure of water vapour represents the
saturation vapour pressure over liquid water for temperatures above the
triple point, over ice for temperatures 20 degrees below the triple
point, and a linear combination of the two for temperatures in-between.
Values over 100% represent supersaturated conditions (typically in the
upper troposphere where it is not uncommon to find atmospheric air to be
supersaturated with respect to ice). [%]